/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.ranger.patch;

import org.apache.commons.lang.StringUtils;
import org.apache.ranger.biz.RangerBizUtil;
import org.apache.ranger.biz.ServiceDBStore;
import org.apache.ranger.common.JSONUtil;
import org.apache.ranger.common.RangerValidatorFactory;
import org.apache.ranger.common.StringUtil;
import org.apache.ranger.db.RangerDaoManager;
import org.apache.ranger.entity.XXServiceDef;
import org.apache.ranger.plugin.model.RangerServiceDef;
import org.apache.ranger.plugin.model.validation.RangerServiceDefValidator;
import org.apache.ranger.plugin.model.validation.RangerValidator.Action;
import org.apache.ranger.plugin.store.EmbeddedServiceDefsUtil;
import org.apache.ranger.service.RangerPolicyService;
import org.apache.ranger.service.XPermMapService;
import org.apache.ranger.service.XPolicyService;
import org.apache.ranger.util.CLIUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Component
public class PatchForKafkaServiceDefUpdate_J10015 extends BaseLoader {
    private static final Logger logger = LoggerFactory.getLogger(PatchForKafkaServiceDefUpdate_J10015.class);

    public static final String SERVICEDBSTORE_SERVICEDEFBYNAME_KAFKA_NAME = "kafka";
    public static final String TRANSACTIONALID_RESOURCE_NAME              = "transactionalid";

    @Autowired
    RangerDaoManager daoMgr;

    @Autowired
    ServiceDBStore svcDBStore;

    @Autowired
    JSONUtil jsonUtil;

    @Autowired
    RangerPolicyService policyService;

    @Autowired
    StringUtil stringUtil;

    @Autowired
    XPolicyService xPolService;

    @Autowired
    XPermMapService xPermMapService;

    @Autowired
    RangerBizUtil bizUtil;

    @Autowired
    RangerValidatorFactory validatorFactory;

    @Autowired
    ServiceDBStore svcStore;

    public static void main(String[] args) {
        logger.info("main()");

        try {
            PatchForKafkaServiceDefUpdate_J10015 loader = (PatchForKafkaServiceDefUpdate_J10015) CLIUtil.getBean(PatchForKafkaServiceDefUpdate_J10015.class);

            loader.init();

            while (loader.isMoreToProcess()) {
                loader.load();
            }

            logger.info("Load complete. Exiting!!!");

            System.exit(0);
        } catch (Exception e) {
            logger.error("Error loading", e);

            System.exit(1);
        }
    }

    @Override
    public void init() throws Exception {
        // Do Nothing
    }

    @Override
    public void printStats() {
        logger.info("PatchForKafkaServiceDefUpdate_J10015 ");
    }

    @Override
    public void execLoad() {
        logger.info("==> PatchForKafkaServiceDefUpdate_J10015.execLoad()");

        try {
            updateHiveServiceDef();
        } catch (Exception e) {
            logger.error("Error while applying PatchForKafkaServiceDefUpdate_J10015...", e);
        }

        logger.info("<== PatchForKafkaServiceDefUpdate_J10015.execLoad()");
    }

    protected Map<String, String> jsonStringToMap(String jsonStr) {
        Map<String, String> ret = null;

        if (!StringUtils.isEmpty(jsonStr)) {
            try {
                ret = jsonUtil.jsonToMap(jsonStr);
            } catch (Exception excp) {
                // fallback to earlier format: "name1=value1;name2=value2"
                for (String optionString : jsonStr.split(";")) {
                    if (StringUtils.isEmpty(optionString)) {
                        continue;
                    }

                    String[] nvArr = optionString.split("=");
                    String   name  = nvArr.length > 0 ? nvArr[0].trim() : null;
                    String   value = nvArr.length > 1 ? nvArr[1].trim() : null;

                    if (StringUtils.isEmpty(name)) {
                        continue;
                    }

                    if (ret == null) {
                        ret = new HashMap<>();
                    }

                    ret.put(name, value);
                }
            }
        }
        return ret;
    }

    private void updateHiveServiceDef() {
        try {
            RangerServiceDef embeddedKafkaServiceDef = EmbeddedServiceDefsUtil.instance().getEmbeddedServiceDef(SERVICEDBSTORE_SERVICEDEFBYNAME_KAFKA_NAME);

            if (embeddedKafkaServiceDef != null) {
                XXServiceDef        xXServiceDefObj            = daoMgr.getXXServiceDef().findByName(SERVICEDBSTORE_SERVICEDEFBYNAME_KAFKA_NAME);
                Map<String, String> serviceDefOptionsPreUpdate = null;

                if (xXServiceDefObj != null) {
                    String jsonStrPreUpdate = xXServiceDefObj.getDefOptions();

                    serviceDefOptionsPreUpdate = jsonStringToMap(jsonStrPreUpdate);
                }

                RangerServiceDef dbKafkaServiceDef = svcDBStore.getServiceDefByName(SERVICEDBSTORE_SERVICEDEFBYNAME_KAFKA_NAME);

                if (dbKafkaServiceDef != null) {
                    List<RangerServiceDef.RangerResourceDef>   embeddedKafkaResourceDefs = embeddedKafkaServiceDef.getResources();
                    List<RangerServiceDef.RangerAccessTypeDef> embeddedKafkaAccessTypes  = embeddedKafkaServiceDef.getAccessTypes();

                    if (checkNewKafkaresourcePresent(embeddedKafkaResourceDefs)) {
                        // This is to check if URL def is added to the resource definition, if so update the resource def and accessType def
                        if (embeddedKafkaResourceDefs != null) {
                            dbKafkaServiceDef.setResources(embeddedKafkaResourceDefs);
                        }

                        if (embeddedKafkaAccessTypes != null) {
                            if (!embeddedKafkaAccessTypes.toString().equalsIgnoreCase(dbKafkaServiceDef.getAccessTypes().toString())) {
                                dbKafkaServiceDef.setAccessTypes(embeddedKafkaAccessTypes);
                            }
                        }
                    }

                    RangerServiceDefValidator validator = validatorFactory.getServiceDefValidator(svcStore);

                    validator.validate(dbKafkaServiceDef, Action.UPDATE);

                    RangerServiceDef ret = svcStore.updateServiceDef(dbKafkaServiceDef);

                    if (ret == null) {
                        logger.error("Error while updating {} service-def", SERVICEDBSTORE_SERVICEDEFBYNAME_KAFKA_NAME);

                        throw new RuntimeException("Error while updating " + SERVICEDBSTORE_SERVICEDEFBYNAME_KAFKA_NAME + "service-def");
                    }

                    xXServiceDefObj = daoMgr.getXXServiceDef().findByName(SERVICEDBSTORE_SERVICEDEFBYNAME_KAFKA_NAME);
                    if (xXServiceDefObj != null) {
                        String              jsonStrPostUpdate           = xXServiceDefObj.getDefOptions();
                        Map<String, String> serviceDefOptionsPostUpdate = jsonStringToMap(jsonStrPostUpdate);

                        if (serviceDefOptionsPostUpdate != null && serviceDefOptionsPostUpdate.containsKey(RangerServiceDef.OPTION_ENABLE_DENY_AND_EXCEPTIONS_IN_POLICIES)) {
                            if (serviceDefOptionsPreUpdate == null || !serviceDefOptionsPreUpdate.containsKey(RangerServiceDef.OPTION_ENABLE_DENY_AND_EXCEPTIONS_IN_POLICIES)) {
                                String preUpdateValue = serviceDefOptionsPreUpdate == null ? null : serviceDefOptionsPreUpdate.get(RangerServiceDef.OPTION_ENABLE_DENY_AND_EXCEPTIONS_IN_POLICIES);

                                if (preUpdateValue == null) {
                                    serviceDefOptionsPostUpdate.remove(RangerServiceDef.OPTION_ENABLE_DENY_AND_EXCEPTIONS_IN_POLICIES);
                                } else {
                                    serviceDefOptionsPostUpdate.put(RangerServiceDef.OPTION_ENABLE_DENY_AND_EXCEPTIONS_IN_POLICIES, preUpdateValue);
                                }

                                xXServiceDefObj.setDefOptions(mapToJsonString(serviceDefOptionsPostUpdate));

                                daoMgr.getXXServiceDef().update(xXServiceDefObj);
                            }
                        }
                    }
                }
            }
        } catch (Exception e) {
            logger.error("Error while updating {} service-def", SERVICEDBSTORE_SERVICEDEFBYNAME_KAFKA_NAME, e);
        }
    }

    private boolean checkNewKafkaresourcePresent(List<RangerServiceDef.RangerResourceDef> resourceDefs) {
        boolean ret = false;

        for (RangerServiceDef.RangerResourceDef resourceDef : resourceDefs) {
            if (TRANSACTIONALID_RESOURCE_NAME.equals(resourceDef.getName())) {
                ret = true;
                break;
            }
        }

        return ret;
    }

    private String mapToJsonString(Map<String, String> map) {
        String ret = null;

        if (map != null) {
            try {
                ret = jsonUtil.readMapToString(map);
            } catch (Exception excp) {
                logger.warn("mapToJsonString() failed to convert map: {}", map, excp);
            }
        }

        return ret;
    }
}
